Carpet adhesive as well as raw material composition, preparation method and application thereof

Abstract

The invention discloses a carpet adhesive as well as a raw material composition, a preparation method and application thereof. The carpet adhesive comprises the following raw materials in parts by weight: 94-132 parts of deionized water, 1-5 parts of an emulsifier, 0.8-3 parts of an initiator, 60 parts of styrene, 20-40 parts of butadiene, 2-5 parts of a hydroxyl acrylate monomer, 0.5-2 parts of a carboxylic acid monomer, 0.5-2 parts of a molecular weight regulator, 1-3 parts of an alkaline substance and 0.6-2 parts of sodium borate. The adhesive prepared by the invention has the characteristics of better bonding effect, long-time cold water resistance, good hot water resistance and durability, and has higher practical value and market competitiveness.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical adhesives, and in particular relates to a carpet adhesive, a raw material composition thereof, a preparation method thereof and an application thereof. Background Art

[0002] In the production process of bathroom carpet adhesive, adhesive is one of the key materials. Existing adhesives include hot melt adhesive and epoxy resin. Hot melt adhesive cures quickly, but in a humid bathroom environment, the adhesive is easily affected by moisture and loses its adhesive strength, causing the carpet adhesive to fall off; epoxy resin has good water resistance, but it takes a long time to cure, and it takes a long time to achieve the best bonding effect, which reduces production efficiency. In addition, adhesives also have the problem of poor performance when exposed to cold or hot water and cannot adapt to changes in bathroom environment temperature. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a carpet adhesive, a raw material composition thereof, a preparation method and application thereof.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] In one aspect, the present invention provides a raw material composition of a carpet adhesive, which comprises the following raw materials in parts by weight:

[0006] 94-132 parts of deionized water, 1-5 parts of emulsifier, 0.8-3 parts of initiator, 60 parts of styrene, 20-40 parts of butadiene, 2-5 parts of hydroxy acrylate monomer, 0.5-2 parts of carboxylic acid monomer, 0.5-2 parts of molecular weight regulator, 1-3 parts of alkaline substance, 0.6-2 parts of sodium borate.

[0007] As a further embodiment of the present invention, the emulsifier is an anionic emulsifier, selected from at least one of sodium alkyl sulfate, sodium alkyl sulfonate, sodium alkylbenzene sulfonate, sodium alkyl diphenyl ether disulfonate, ammonium alkyl alcohol ether sulfate, and sodium salt of alkyl alcohol ether sulfosuccinate; wherein the alkyl group is preferably a C8-C18 alkyl group, more preferably a C8-C16 alkyl group, and most preferably at least one of sodium C8-C14 alkyl sulfate, sodium C8-C14 alkyl sulfonate, sodium C8-C14 alkylbenzene sulfonate, sodium C8-C14 alkyl diphenyl ether disulfonate, ammonium C8-C14 alkyl alcohol ether sulfate, and sodium C8-C14 alkyl alcohol ether sulfosuccinate. As a further preferred embodiment, the present invention selects an alkyl group of C12 as the emulsifier.

[0008] And / or, the initiator is selected from at least one of sodium persulfate, ammonium persulfate and potassium persulfate.

[0009] As a further embodiment of the present invention: the hydroxy acrylate monomer is selected from at least one of hydroxyethyl acrylate, hydroxyethyl methacrylate, β-hydroxypropyl acrylate, and β-hydroxypropyl methacrylate;

[0010] And / or, the carboxylic acid monomer is selected from at least one of acrylic acid, methacrylic acid, maleic acid, fumaric acid or itaconic acid.

[0011] As a further embodiment of the present invention: the molecular weight regulator is selected from at least one of n-dodecyl mercaptan, tert-dodecyl mercaptan and n-butyl mercaptan;

[0012] And / or, the alkaline substance is selected from hydroxides of alkali metals.

[0013] In another aspect, the present invention provides a method for preparing a carpet adhesive, wherein the raw materials of the carpet adhesive include the raw material composition of the carpet adhesive, and the method specifically comprises the following steps:

[0014] (1) Add deionized water, emulsifier and initiator into a polymerization kettle under vacuum, stir and heat to 70-90° C.;

[0015] (2) adding a mixture solution of styrene, butadiene, hydroxyacrylate monomer, carboxylic acid monomer and molecular weight regulator dropwise into the polymerization kettle to carry out free radical emulsion polymerization, and heating the mixture to 80-90° C. and keeping the temperature for 2 hours;

[0016] (3) After cooling, adjust the pH to 4-6 with an alkaline substance, add sodium borate under stirring until it is completely dissolved, and filter to obtain the carpet adhesive.

[0017] As a further solution of the present invention: in step (1), the vacuum degree of the polymerization kettle is ≤-0.08MPa.

[0018] As a further solution of the present invention: in step (2), the dripping time is 3 to 6 hours.

[0019] As a further solution of the present invention: in step (2), the temperature of the free radical emulsion polymerization is 70°C to 90°C.

[0020] The third aspect of the present invention provides a carpet adhesive, which is prepared by the method for preparing the carpet adhesive as described above.

[0021] A fourth aspect of the present invention provides use of the carpet adhesive in bathroom carpets.

[0022] The beneficial effects of the present invention are:

[0023] The present invention selects hydroxy acrylate monomers and carboxylic acid monomers in a reasonable ratio as composite crosslinking agents, and adopts sodium borate as a reinforcing crosslinking agent to synthesize an adhesive for carpet backing glue. The adhesive of the present invention can accelerate the degree of crosslinking when exposed to cold water or hot water. Under hot conditions, on the one hand, the hydroxyl and carboxyl monomers can be further dehydrated to undergo crosslinking, delaying the rapid decline in performance caused by aging and degradation of the adhesive when heated. On the other hand, due to the hydrolysis of sodium borate, boric acid can be rapidly complexed with the hydroxyl and carboxyl groups in the hydroxyl monomers and carboxylic acid monomers during dehydration and drying to form a crosslinked structure, thereby enhancing the adhesive strength of the carpet backing glue. Double crosslinking can ensure that the adhesive backing product maintains the stability of the adhesive strength (peeling strength) after multiple immersions in cold and hot water, thereby achieving the purpose of long-lasting durability of the product. Compared with ordinary adhesives in the prior art, the adhesive of the present invention has a better bonding effect, and can more firmly bond the carpet backing glue to the ground, making it durable. DETAILED DESCRIPTION

[0024] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples. The experimental methods in the following examples without specifying specific conditions are selected according to conventional methods and conditions, or according to the product specifications. In addition, the reagents and raw materials used in the present invention are all commercially available.

[0025] Example 1

[0026] A carpet adhesive, the raw material composition of which includes the following components in parts by weight, see Table 1;

[0027] Table 1

[0028]

[0029]

[0030] The preparation method comprises the following steps:

[0031] After the polymerization kettle is evacuated to -0.08MPa, deionized water, sodium alkyl sulfate and sodium persulfate are added, the temperature is raised to 70°C, and a mixture solution of styrene, butadiene, hydroxyethyl acrylate, acrylic acid and n-dodecyl mercaptan is added dropwise for free radical emulsion polymerization. The polymerization temperature is 70°C and the reaction time is 3 hours. The temperature is raised to 90°C and kept for 2 hours. After cooling, the pH is adjusted to 4-6 with a sodium hydroxide aqueous solution. Sodium borate is added under stirring until it is completely dissolved and filtered to obtain a bathroom carpet adhesive emulsion.

[0032] Example 2

[0033] A carpet adhesive, the raw material composition of which includes the following components in parts by weight, see Table 2;

[0034] Table 2

[0035]

[0036]

[0037] The preparation method comprises the following steps:

[0038] After the polymerization kettle is evacuated to -0.08MPa, deionized water, sodium dodecylsulfonate, sodium dodecylbenzenesulfonate, and ammonium persulfate are added, stirring is started and the temperature is raised to 90°C, and a mixture solution of styrene, n-hexyl acrylate, butadiene, acrylic acid, maleic acid, hydroxyethyl methacrylate, β-hydroxypropyl acrylate, and tert-dodecyl mercaptan is added dropwise to carry out free radical emulsion polymerization, the polymerization temperature is 90°C, the dropping time is 6 hours, the temperature is raised to 80°C and kept warm for 2 hours, after cooling, the pH is adjusted to 4-6 with potassium hydroxide alkaline substance, sodium borate is added under stirring until it is completely dissolved, and after filtration, a bathroom carpet adhesive emulsion is obtained.

[0039] Example 3

[0040] A carpet adhesive, the raw material composition of which includes the following components in parts by weight, see Table 3;

[0041] Table 3

[0042]

[0043]

[0044] The preparation method comprises the following steps:

[0045] After the polymerization kettle is evacuated to -0.08MPa, deionized water, sodium dodecyl sulfate, sodium dodecyl alcohol ether sulfosuccinate, and potassium persulfate are added, stirring is started, and the temperature is raised to 80°C. A mixture solution of styrene, butadiene, β-hydroxypropyl methacrylate, itaconic acid, methacrylic acid, and tert-dodecyl mercaptan is added dropwise to carry out free radical emulsion polymerization. The polymerization temperature is 80°C, the dropping time is 4.5 hours, the temperature is raised to 85°C and kept warm for 2 hours, and after cooling, the pH is adjusted to 4-6 with an alkaline substance such as sodium hydroxide, and sodium borate is added under stirring until it is completely dissolved. After filtering, a bathroom carpet adhesive emulsion is obtained.

[0046] Example 4

[0047] A carpet adhesive, the raw material composition of which includes the following components in parts by weight, see Table 4;

[0048] Table 4

[0049]

[0050]

[0051] The preparation method comprises the following steps:

[0052] After the polymerization kettle is evacuated to -0.08MPa, deionized water, sodium dodecyl sulfate, ammonium dodecylphenol ether sulfate, ammonium persulfate, and sodium persulfate are added, stirring is started and the temperature is raised to 85°C, and a mixture solution of styrene, butadiene, β-hydroxypropyl acrylate, fumaric acid, acrylic acid, and n-dodecyl mercaptan is added dropwise to carry out free radical emulsion polymerization. The polymerization temperature is 85°C, the dropping time is 5 hours, the temperature is raised to 90°C and kept warm for 2 hours, and after cooling, the pH is adjusted to 4-6 with potassium hydroxide alkaline substance, and sodium borate is added under stirring until it is completely dissolved. After filtering, a bathroom carpet adhesive emulsion is obtained.

[0053] Comparative Example 1

[0054] Take commercially available Trinseo 2829 adhesive.

[0055] Comparative Example 2

[0056] The only difference from Example 4 is that no sodium borate is added.

[0057] Comparative Example 3

[0058] The only difference from Example 4 is that sodium borate and hydroxyacrylate monomer (β-hydroxypropyl acrylate) are not added.

[0059] Comparative Example 4

[0060] The only difference from Example 4 is that the hydroxy acrylate monomer (β-hydroxypropyl acrylate) is 6 parts, the fumaric acid is 1.5 parts, and the acrylic acid is 0.75 parts. The viscosity of the obtained emulsion is a paste. It is impossible to prepare a coating. No subsequent testing is performed.

[0061] Comparative Example 5

[0062] The only difference from Example 4 is that 1.6 parts of sodium borate are replaced by 1.6 parts of sodium phosphate.

[0063] Comparative Example 6

[0064] The only difference from Example 4 is that no carboxylic acid monomer is added.

[0065] Effect Example

[0066] The samples prepared in Examples 1 to 4 and Comparative Examples 1 to 6 of the present application were evaluated according to the evaluation method for the cold and hot water resistance of bathroom carpet adhesives of Fortel Carpet Co., Ltd.

[0067] 1. The latex prepared in Examples 1 to 4 and Comparative Examples 2 to 6 were respectively modulated to have a solid content of 46% consistent with that in Comparative Example 1, and then carpet backing adhesive coatings were prepared according to the ratio of latex: heavy calcium carbonate: water: thickener by mass of 100:200:10:0.5, wherein the heavy calcium carbonate used was a grade 65 heavy calcium carbonate product produced by Dongsheng Shengxu New Materials Shandong Co., Ltd., and the thickener was a commercially available TLA-thickener.

[0068] 2. Apply the above carpet adhesive coating at a coating amount of 1.5 kg / m 2 The prepared carpet sample was placed in an oven at 120°C for 10 minutes until it was completely dry.

[0069] 3. Soak the latex-backed carpet samples in 80°C hot water and 25°C water for 30 minutes, then take them out and air dry. Repeat 3 times. Test the peeling force of the mesh cloth respectively.

[0070] 4. Compare and test the mesh peeling force (N) of each latex sample carpet before and after soaking in water. Execute the standard GBT26843-2011. The results are shown in Table 5:

[0071] Table 5

[0072]

[0073]

[0074] The mesh cloth peeling force ≥15N is qualified.

[0075] Through the test data of the above embodiments and comparative examples, it can be clearly understood that the adhesive of the present application maintains a good bonding effect in the case of cold and hot water. Compared with the commercially available Trinseo adhesive and comparative examples 2 to 5, the product of the present application has a better bonding resistance attenuation effect after repeated immersion in hot and cold water.

[0076] Finally, it should be noted that in the present invention, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0077] Although the present disclosure has been disclosed above through the description of the specific embodiments of the present disclosure, it should be understood that those skilled in the art can design various modifications, improvements or equivalents to the present disclosure within the spirit and scope of the attached scheme. These modifications, improvements or equivalents should also be considered to be included in the scope of protection claimed by the present disclosure.

Claims

1. A raw material composition for a carpet adhesive, characterized in that: It contains the following raw materials in parts by weight: 94-132 parts of deionized water, 1-5 parts of emulsifier, 0.8-3 parts of initiator, 60 parts of styrene, 20-40 parts of butadiene, 2-5 parts of hydroxy acrylate monomer, 0.5-2 parts of carboxylic acid monomer, 0.5-2 parts of molecular weight regulator, 1-3 parts of alkaline substance, 0.6-2 parts of sodium borate.

2. The raw material composition of the carpet adhesive according to claim 1, characterized in that: The emulsifier is an anionic emulsifier, selected from at least one of alkyl sodium sulfate, alkyl sodium sulfonate, alkyl sodium benzene sulfonate, alkyl diphenyl ether sodium disulfonate, alkyl alcohol ether ammonium sulfate, and alkyl alcohol ether sodium sulfosuccinate; And / or, the initiator is selected from at least one of sodium persulfate, ammonium persulfate and potassium persulfate.

3. The raw material composition of the carpet adhesive according to claim 1, characterized in that: The hydroxy acrylate monomer is selected from at least one of hydroxyethyl acrylate, hydroxyethyl methacrylate, β-hydroxypropyl acrylate, and β-hydroxypropyl methacrylate; And / or, the carboxylic acid monomer is selected from at least one of acrylic acid, methacrylic acid, maleic acid, fumaric acid or itaconic acid.

4. The raw material composition of the carpet adhesive according to claim 1, characterized in that: The molecular weight regulator is selected from at least one of n-dodecyl mercaptan, tert-dodecyl mercaptan and n-butyl mercaptan; And / or, the alkaline substance is selected from hydroxides of alkali metals.

5. A method for preparing a carpet adhesive, characterized in that: The raw material of the carpet adhesive comprises the raw material composition of the carpet adhesive as claimed in any one of claims 1 to 4, and specifically comprises the following steps: (1) Add deionized water, emulsifier and initiator into a polymerization kettle under vacuum, stir and heat to 70-90° C.; (2) adding a mixture solution of styrene, butadiene, hydroxyacrylate monomer, carboxylic acid monomer and molecular weight regulator dropwise into the polymerization kettle to carry out free radical emulsion polymerization, and heating the mixture to 80-90° C. and keeping the temperature for 2 hours; (3) After cooling, adjust the pH to 4-6 with an alkaline substance, add sodium borate under stirring until it is completely dissolved, and filter to obtain the carpet adhesive.

6. The method for preparing the carpet adhesive according to claim 5, characterized in that: In step (1), the vacuum degree of the polymerization kettle is ≤-0.08MPa.

7. The method for preparing the carpet adhesive according to claim 5, characterized in that: In step (2), the dropping time is 3 to 6 hours.

8. The method for preparing the carpet adhesive according to claim 5, characterized in that: In step (2), the temperature of the free radical emulsion polymerization is 70 to 90°C.

9. A carpet adhesive, characterized in that: The carpet adhesive is prepared by the method for preparing the carpet adhesive according to any one of claims 5 to 8.

10. Use of the carpet adhesive according to claim 9 in bathroom carpets.

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